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<h1 class="page_title">Manifest Version</h1>
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<div id="static"><div id="pageData-name" class="pageData">Manifest Version</div>
<p>
Extensions, themes, and applications are simply bundles of resources, wrapped
up with a <a href="manifest.html"><code>manifest.json</code></a> file that
describes the package's contents. The format of this file is generally stable,
but occasionally breaking changes must be made to address specific issues.
Developers should specify which version of the manifest specification their
package targets by setting a <code>manifest_version</code> key in their
manifests.
</p>
<h2>Current Version</h2>
<p>
When targeting Chrome 18 and above, developers should specify
<strong><code>'manifest_version': 2</code></strong>:
</p>
<pre>{
...,
"manifest_version": 2,
...
}</pre>
<p>
Manifest version 1 is <em>deprecated</em> in Chrome 18 and above, but version
2 is not yet <em>required</em>. Extensions, applications, and themes that
aren't ready to make the jump to the new manifest version in Chrome 18 can
either explicitly specify version <code>1</code>, or leave the key off
entirely.
</p>
<p>
At some point in the future, support for manifest version 1 will be removed.
Ample warning will be provided, beginning with warnings when loading unpacked
version 1 extensions, and escalating from there over time.
</p>
<p class="caution">
Setting <code>manifest_version</code> 2 in Chrome 17 or lower is not
recommended. If your extension needs to work in older versions of Chrome,
stick with version 1 for the moment. We'll give you ample warning before
version 1 stops working.
</p>
<h2>Changes between version 1 and 2</h2>
<ul>
<li>
<p>
A content security policy is set to <code>`script-src 'self'; object-src
'self'</code> by default. This has a variety of impacts on developers,
described at length in the <a href="contentSecurityPolicy.html">
<code>content_security_policy</code></a> documentation.
</p>
</li>
<li>
<p>
A package's resources are no longer available by default to external
websites (as the <code>src</code> of an image, or a <code>script</code>
tag). If you want a website to be able to load a resource contained in
your package, you'll need to explicitly whitelist it via the
<a href="manifest.html#web_accessible_resources">
<code>web_accessible_resources</code>
</a> manifest attribute. This is particularly relevant for extensions that
build up an interface on a website via injected content scripts.
</p>
</li>
<li>
<p>
The <code>background_page</code> property has been replaced with a
<code>background</code> property that contains <em>either</em> a
<code>scripts</code> or <code>page</code> property. Details are available
in the <a href="background_pages.html">Background Pages</a> documentation.
</p>
</li>
<li>
<p>
A variety of previously deprecated features have been removed entirely:
</p>
<ul>
<li>
<p>
The <code>page_actions</code> key in the manifest, and the
<code>chrome.pageActions</code> API are gone. Use the singular
<a href="pageAction.html">
<code>page_action</code> and <code>chrome.pageAction</code>
</a> instead.
</p>
</li>
<li>
<p>
<code>chrome.extension.getTabContentses</code> (!!!) and
<code>chrome.extension.getExtensionTabs</code> are gone. Use
<a href="extension.html#method-getViews">
<code>chrome.extension.getViews({ "type": "tab" })</code>
</a> instead.
</p>
</li>
<li>
<p>
<code>Port.tab</code> is gone. Use
<a href="extension.html#type-Port"><code>Port.sender</code></a>
instead.
</p>
</li>
<li>
<p>
The <code>icons</code> property of <code>page_action</code> has been
removed. Use <a href="pageAction.html#manifest">
the <code>default_icon</code> property
</a> or <a href="pageAction.html#method-setIcon">
<code>chrome.pageAction.setIcon</code>
</a> instead.
</p>
</li>
<li>
<p>
The <code>name</code> property of <code>page_action</code> has been
removed. Use <a href="pageAction.html#manifest">
the <code>default_title</code> property
</a> or <a href="pageAction.html#method-setTitle">
<code>chrome.pageAction.setTitle</code>
</a> instead.
</p>
</li>
<li>
<p>
The <code>popup</code> property of <code>page_action</code> has been
removed. Use <a href="pageAction.html#manifest">
the <code>default_popup</code> property
</a> or <a href="pageAction.html#method-setPopup">
<code>chrome.pageAction.setPopup</code>
</a> instead.
</p>
</li>
<li>
<p>
The <code>default_popup</code> property of <code>page_action</code>
can no longer be specified as an object. It must be a string.
</p>
</li>
<li>
<p>
The <code>chrome.self</code> API has been removed. Use
<a href="extension.html"><code>chrome.extension</code></a> instead.
</p>
</li>
</ul>
</li>
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